Fatal error: Class 'Illuminate\Support\NamespacedItemResolver' not found in /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Config/Repository.php on line 7

Call Stack:
    0.0006     284736   1. {main}() /var/www/html/dev/spa/vendor/laravel/framework/src/Illuminate/Config/Repository.php:0